The amount of data stored in organisational databases has increased rapidly in recent years due to the rapid advancement of information technology. A high percentage of the data is sensitive, private and critical to those organisations, their clients, suppliers and partners.
Therefore, databases are usually installed behind internal firewalls, protected with intrusion detection mechanisms and accessed only by applications. To access a database, users have to connect to one of these applications and submit queries through them to the database. The threat to databases arises when these applications do not behave properly and construct these queries without sanitising user inputs first.
Although a common problem with web applications, this vulnerability can affect any application that communicates with a database management system via Structured Query Language.
A SQL injection occurs when the application fails to properly sanitize user-supplied input used in SQL queries. In this way an attacker can manipulate the SQL statement that is passed to the back-end database management system. This statement will run with the same permissions as the application that executed the query.
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